Disclosure. Thoracolumbar Tumors. Intraspinal Tumor Removal Options 6/4/2011. Minimally Invasive Approaches for Spinal Tumors
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1 Minimally Invasive Approaches for Spinal Tumors Praveen V. Mummaneni, M.D. Disclosure Medtronic (Consultant, Grants) DePuy (Consultant, Other Financial Support) Associate Professor Dept. of Neurosurgery Director: Minimally Invasive Spine Surgery Co-Director: UCSF Spine Center University of California, San Francisco Intradural Extramedullary Intramedullary Extradural Thoracolumbar Tumors Intraspinal Tumor Removal Options Open Approach Midline spinal incision Muscle Retraction Wide exposure of tumor Minimally Invasive (Tubular) and Mini-open (Expandable tube) Smaller incision More limited tumor access? Muscles dilated Less tissue retraction Shorter hospitalization? Less blood loss? Decreased dead space for accumulation of pseudomeningoceles? 1
2 Location of the Minimally Invasive Incision Large Intradural Spinal Tumors 1- Midline intradural tumors 1- Disc 2 Paramedian intradural 2 PLIF or extradural tumors 3 - TLIF 3 Foraminal tumors Traditional Open Approach to Intradural Spinal Tumors Traditional Approach: Midline incision (two levels rostral and caudal to pathology) Muscle Dissection, Laminectomy If near cervicothoracic or TL jxn May add fusion to prevent kyphosis Traditional Approach: Intradural Spinal Tumor + Proven safety and Efficacy (McCormick Clin Neurosurg, 1994; Tobias: Childs Nerv Syst 2008) - Concern for: chronic pain and postlaminectomy kyphosis (Iguchi,Spine 2000) - Need for fusion? 7 8 2
3 Intradural Spinal Tumor: Min Inv Tech Limited tissue destruction Achieving same surgical goal, possibly reducing incidence of iatrogenic instability Reduced blood loss Improved speed of recovery Bresnahan Spine 2009; Costa J Neurosurg Spine 2007; Khoo Neurosurg 2002; Rahman Minim Invasive Neurosurg 2008; Thome J Neurosurg Spine 2005 Intradural Spinal Tumor Mini-Open trans-spinous approach for intradural tumors in the thoracolumbar spine Midline incision Utilizing expandable retractors Preserve lateral lamina, facets and muscle attachments 9 10 A B C D A B C D Cadaveric Study: Comparison of MIS vs Open Exposure of the T6-7 levels: MIS affords 50-75% smaller incision Lu, Dhall, Mummaneni: Submitted: Neurosurgery E F G H Steps for MIS Trans-Spinous approach E F G H
4 Cadaver Findings: Incision length is 50% less in thin patients and 75% less in obese pts (BMI >30) Case Illustration Case No. BMI MIS Incision Length (cm) Open Incision Length (cm) cm 15.0 cm 3.0 Levels of Thoracic Lamina Accessed 40 y/o female with 3-months progressive paraparesis with urinary incontinence Neuro exam reveals 2/5 strength in bilateral lower extremity with hyper-reflexia and clonus SECTION HEADING MRI: Intradural, Extramedullary Tumor at T4 A B C D MIS Trans-spinous T3-T5 tumor resection E F G H Tumor Spinal Cord
5 Intradural Meningioma 1 yr F/U: ambulates independently and regained bladder control A B C D Preop E F G H Postop 18 Case Example: Intradural, Intrameduallary Tumor Case 46 year-old woman with progressive paraparesis for 2 years History of chest radiation for lymphoma 8/2006 5/2008 Pt first had numbness in her legs followed by weakness Now with complete paraplegia and incontinence 5
6 Differential Diagnosis Multiple Sclerosis Treated for presumed multiple sclerosis MRI of brain is normal Radiation Myelitis Spinal Cord Tumor Lymphoma? Primary cord tumor? Biopsy needed to ascertain the diagnosis Mini Inv Biopsy of Cord Path Result: Glioblastoma of Cord Extends 8 Segments Can not perform gross total removal Pt treated with radiation and chemotherapy 6
7 Trans-Spinous MIS Intradural Tumor Experience Initial Experience: 3 MIS Intradural Tumor Cases Patient Demographics Initial Report of 3 MIS intradural tumor cases Lu, Dhall, Mummaneni: Submitted: Neurosurgery Current Experience: 15 Cases Patient No. Age (yr)/sex Duration of symptoms (mo) Level 1 46/F 24 T5-T6 28 BMI 2 40/F 6 T3-T /M 3 T6-T Initial Experience: 3 MIS Intradural Tumor Cases Pre- and Postoperative Neurological Findings Operative Statistics Patient No. Preop Sensory Symptoms Preop Motor Deficit Postop Sensory Postop Motor Patient No. Pathology Lami Levels EBL (cc) OR Time (min) Length of incision (cm) Length of hospital stay (h) 1 T4 sensory level 2 Thoracic and leg pain 3 T6 sensory level Paraplegia T4 sensory level 2/5 Resolving pain Paraplegia 4/5 3/5 None 4+/5 1 GBM* T5-T Meningioma T3-T Meningioma T6-T *GBM = gliobastoma multiforme
8 SECTION HEADING Patient No. Pre- and post-operative Modified Prolo Score Follow-up period (mo) Preop Modified Prolo Postop Modified Prolo For Lesions Ventral to the Cord, May Add Transpedicular Approach 1 20 P1F2E2M1 P3F4E4M P1F1E2M2 P4F4E4M P2F2E3M1 P4F4E5M Paramedian Intradural Tumors Min Inv. Hemilaminectomy Paramedian Incision Dilate paraspinal muscles Place retractor to expose hemilamina 31 8
9 Paramedian Intradural Spinal Tumors MIS Technique Hemilaminectomy Leave Spinous Process and Interspinous Ligaments Intact Avoid Iatrogenic Instability 33 Minimally Invasive TL Jxn Hemi-Laminectomy: Avoids Fusion Case Illustration: Hemilaminectomy for Intradural, Extramedullary Tumor 20 yo woman with back pain, bilateral leg radicular pain Unable to sit for 1 minute Urinary urgency 9
10 3. Mini-Open Foraminal Tumor Resection Nerve Sheath Tumors account for onethird of all primary spinal neoplasms (Nittner, Acta Neurol Psych, 1968). Mini-Open Resection of Nerve Sheath Tumor (Lu, Dhall, Mummaneni, JNS Spine 2009) Mini-Open Removal of Foraminal Tumors Traditional surgical approach is laminectomy, unilateral facetectomy (if tumor extends beyond intervertebral foramen), and fusion Jinnai Neurosurg 2005; Ozawa J Neurosurg Spine 2007 Disadvantage of traditional approach is possible destabilization, large incision, muscle dissection, pain. 10
11 Results Case Illustration 48 y/o obese male h/o L3-S1 circumferential fixation with one year of knee pain and right knee flexion weakness MRI - mass in left L3-4 foramen 42 SECTION HEADING Case Illustration Mini-open paramedian approach Pseudarthrosis found at L3-4 level. Tumor resection performed. L3-4 instrumentation and fusion performed. Follow-up at 1 year demonstrated complete recovery of motor strength. Improving knee pain. Preop Postop MRI showed GTR and no recurrence
12 4. Epidural Mets Case 60 yo male Obese Prostate cancer hx Became paraparetic with urine retention 6 hrs ago Too big to fit into MRI 330 pounds/150 kg Lami for epidural tumor Complications Can Strike When You Least Expect It Use Flouro Trust the images over your gut feel Don t erase the benefits of MIS with increased complication rates 12
13 Conclusions Mini Open Approaches Combine Open Landmarks with Smaller Incisions Minimally invasive techniques may: decrease hospitalization Decrease blood loss There is a learning curve Elderly patients have medical comorbidities and osteoporosis that must be taken into account Fusion rate in Deformity cases is unknown 13
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